Question

a driver dove to a location 6 3/5 meters below sea level he then dove to a second location 8 1/5 meters below sea level how many meters are there between the two locatiojn

Answer 1

Answer: 1 3/5 meter below sea level

In this case, a diver goes into two different location expressed with "meters below sea level" unit. To know the distance between the two location, then you need to subtract it. 
Distance = 2nd location - 1st location 
Distance = 8 1/5 meter below sea level - 6 3/5 meter below sea level= 1 3/5 meter below sea level